1. Wichtl, M. (2004). Herbal Drugs and Phytopharmaceuticals, A Handbook of Practice on a Scientific Basis, CRC Press. [3rd ed.].
2. Bown, D. (1995). Encyclopedia of Herbs and Their Uses, Dorling Kindersley.
3. Antimitotic and antibacterial effects of the Primula veris L.;flower extracts. Caryologia,2008
4. EMA (European Medicines Agency) (2012). Assessment Report on Primula veris L. and/or Primula elatior (L.) Hill, Flos, EMA/HMPC/136583/2012. 2012a.
5. EMA (European Medicines Agency) (2012). Assessment Report on Primula veris L. and/or Primula elatior (L.) Hill, Radix, EMA/HMPC/113577/2012EMA. 2012b.